If you were feeling bad about not having an iPhone 5s and that cool slow-mo feature, you can now get close with a new US$1.99 app called SlowCam. The app records to your iPhone storage, then quickly renders it to your camera roll. Rendering of one video clip can take place while you are recording another. An iPhone 5/5c can capture video at 60 FPS, the new iPhone 5s at 120 FPS, and even the older iPhone 4 captures at 30 FPS. The app requires iOS 7.
To get going, you tap and hold the 'slow motion' button on screen. Taking your finger off the button gives you regular speed, then pressing and holding again slows things down. Great, for example, at recording a high dive from a diving board. Regular speed as the diver climbs the